Crosslink density measurement sheet

Abstract

Disclosed is a crosslinking density measurement sheet from which information for determining an actual manufacturing condition of a laminator for manufacturing a solar cell module is obtainable. The manufacturing condition of a laminator for manufacturing a solar cell module can be determined within a short period of time by constituting the crosslinking density measurement sheet as a composite sheet provided with a support and a rubber sheet member integrated with the support and estimating a crosslinking density of a encapsulant within a solar cell module from a change of the crosslinking density of the rubber sheet member before and after a laminating treatment with the laminator for manufacturing a solar cell module.

1 . A crosslinking density measurement sheet comprising a composite sheet provided with a support and a rubber sheet member integrated with the support, wherein
 a crosslinking density of a encapsulant within a solar cell module can be calculated from a change of crosslinking density of the rubber sheet member before and after a laminating treatment by a solar cell module manufacturing laminator.   
     
     
         2 . The crosslinking density measurement sheet according to  claim 1 , wherein the solar cell module manufacturing laminator is a laminating apparatus having an upper chamber and a lower chamber partitioned from each other by a diaphragm, in which a material to be processed is disposed on a hot plate provided in the lower chamber, and the material to be processed as heated by the hot plate is laminated by evacuating the lower chamber, introducing the air into the upper chamber, and compressing the material by the hot plate and the pressing member. 
     
     
         3 . The crosslinking density measurement sheet according to  claims 1  to  2 , wherein at least one of a slit part, a concave part, and a through-hole part is formed in the rubber sheet member. 
     
     
         4 . The crosslinking density measurement sheet according to  claim 3 , wherein the slit part is a linear groove having a width of from 0.1 mm to 5 mm, and the number of the groove is 1 to 10 per cm of the rubber sheet member. 
     
     
         5 . The crosslinking density measurement sheet according to  claim 3 , wherein the concave part is a linear groove having a width of from 0.1 mm to 5 mm, and the number of the groove is 1 to 10 per cm of the rubber sheet member. 
     
     
         6 . The crosslinking density measurement sheet according to  claim 3 , wherein the number of the concave part or the through-hole part is 1 to 10 per cm 2  of the rubber sheet member. 
     
     
         7 . The crosslinking density measurement sheet according to  claims 3 ,  5  and  6 , wherein the concave part is fabricated by embossing. 
     
     
         8 . The crosslinking density measurement sheet according to  claims 1  to  7 , wherein the crosslinking density of the rubber sheet member is from 9.0×10 −3  to 9.0×10 −7  moles/cm 3 . 
     
     
         9 . The crosslinking density measurement sheet according to  claims 1  to  8 , wherein a main component of the rubber sheet member is an ethylene/α-olefin copolymer rubber (EPM) and/or an ethylene/α-olefin/non-conjugated diene copolymer rubber (EPDM). 
     
     
         10 . The crosslinking density measurement sheet according to  claim 9 , wherein a carbon number of the α-olefin is from 2 to 8. 
     
     
         11 . A method for manufacturing a crosslinking density measurement sheet including a composite sheet provided with a support and a rubber sheet member integrated with the support, wherein a crosslinking density of a encapsulant within a solar cell module can be calculated from a change of crosslinking density of the rubber sheet member before and after a laminating treatment by a solar cell module manufacturing laminator, the method comprising
 a step of measuring a time t 10  (encapsulant) until reaching 10% of a maximum torque at the time of measuring a vulcanization curve by a vulcanization test on a encapsulant for a solar cell module,   a step of measuring a time t 90  (encapsulant) until reaching 90% of a maximum torque at the time of measuring a vulcanization curve by a vulcanization test on a encapsulant for a solar cell module, and   a step of adjusting a crosslinking rate by adding an additive to a rubber member such that a time t 10  (measurement sheet) until reaching 10% of a maximum torque at the time of measuring a vulcanization curve by a vulcanization tester on a rubber member in a crosslinking density measurement sheet and a time t 90  (measurement sheet) until reaching 90% of a maximum torque at the time of measuring a vulcanization curve by a vulcanization tester on a rubber member in a crosslinking density measurement sheet satisfy the following equations (1) and (2):
   0.8≦ t   10 (encapsulant)/ t   10 (measurement sheet)≦1.2  (1)
 
   0.8 ≦t   90 (encapsulant)/ t   90 (measurement sheet)≦1.2  (2)
 
   
     
     
         12 . The method for manufacturing a crosslinking density measurement sheet according to  claim 11 , wherein the solar cell module manufacturing laminator is a laminating apparatus having an upper chamber and a lower chamber partitioned from each other by a diaphragm, in which a material to be processed is disposed on a hot plate provided in the lower chamber, and the material to be processed as heated by the hot plate is laminated by evacuating the lower chamber, introducing the air into the upper chamber, and compressing the material by the hot plate and the pressing member. 
     
     
         13 . The method for manufacturing a crosslinking density measurement sheet according to  claims 11  to  12 , wherein at least one of a slit part, a concave part, and a through-hole part is formed in the rubber sheet member. 
     
     
         14 . The method for manufacturing a crosslinking density measurement sheet according to  claim 13 , wherein the slit part is a linear groove having a width of from 0.1 mm to 5 mm, and the number of the groove is 1 to 10 per cm of the rubber sheet member. 
     
     
         15 . The method for manufacturing a crosslinking density measurement sheet according to  claim 13 , wherein the concave part is a linear groove having a width of from 0.1 mm to 5 mm, and the number of the groove is 1 to 10 per cm of the rubber sheet member. 
     
     
         16 . The method for manufacturing a crosslinking density measurement sheet according to  claim 13 , wherein the number of the concave part or the through-hole part is 1 to 10 per cm 2  of the rubber sheet member. 
     
     
         17 . The method for manufacturing a crosslinking density measurement sheet according to  claims 13 ,  15  and  16 , wherein the concave part is fabricated by embossing. 
     
     
         18 . The method for manufacturing a crosslinking density measurement sheet according to  claims 11  to  17 , wherein the crosslinking density of the rubber sheet member is from 9.0×10 −3  to 9.0×10 −7  moles/cm 3 . 
     
     
         19 . The method for manufacturing a crosslinking density measurement sheet according to  claims 11  to  18 , wherein a main component of the rubber sheet member is an ethylene/α-olefin copolymer rubber (EPM) and/or an ethylene/α-olefin/non-conjugated diene copolymer rubber (EPDM). 
     
     
         20 . The method for manufacturing a crosslinking density measurement sheet according to  claim 19 , wherein a carbon number of the α-olefin is from 2 to 8.